Process of treating ores to produce lead chlorid and chlorin gas.



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rrED STATES PATENT. ornron.

JOHN L. mania, or DENVER, ooLon ADo. I Y

PROCESS OF TREATING ORES TO PRODUCE LEAD CHLORID AND CHLORIN GAS.

To all whom it may concern:

Be it known that I, JOHN L. MALM,'a'

citizen of the United. States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements. in Processes of Treating Ores to Produce Lead I Chlorid and .Chlorin Gas, of which the following is a I specification.

This invention relates generally to processes for treating metal bearing materlals and particularly to a process for producing lead to the action of chlorin and moisture in suflicient-quantities to form lead sulfate v and hydrochloric 'acid. This action isbrought about in any suitable receptacle,

' the lead sulfate remains with the ore;

ore is then mixed with a hot saturated sosuch as a tube mill, and if there is not suficient internal heat, external heat is supplied to make up this deficiency. Hydrochloric acid comes off as gas and is collected in any suitable manner for use in the process, while lution of any salt, which is susceptible of giving its chlorin over to the lead sulfate in the mass, the temperature'being maintained at a point which will give the greatest possible reaction. I prefer to use a concentrated or saturated solution of common salt and water. The result of this treatment is that lead chlorid and sodium sulfate vare formed. When the solution is allowed to cool, the lead chlorid is thrown down and may be collected in any suitable manner and Specification of Letters Patent. Application flled hecember 12, 1914. Serial No. 876,981.

The 1 Patented Mar. 12, 1918.

treated to liberate the chlorin gas. This treatment of the ore containing the lead sulfate is conducted in any suitable apparatus, as for example, in a combinedagitator and filter barrel. During the steps of the process, the other metal contents of the ore have been converted into chlorids and they may be treated in any suitable manner to obtain the values.

Having described my invention, 1 claim 1. The process of treating substances containing lead and other sulfids, consisting in subjectin the substance to the action of chlorin gas in the presence of moisture at a temperature high enough to convert sub-- stantially the entire lead content into lead sulfate with hydrochloric acid as a byproduct;

taining lead and other sulfids, consisting in subjecting the substance to the action of chlorin gas in the presence of moisture at a temperature high enough to convert substantially the entire lead content into lead sulfate with hydrochloric acid as a byproduct, dissolving the lead sulphate with hot concentrated brine, thereby causing double decomposition and forming lead chlorid in solution, cooling the solution to precipitate the lead chlorid, treating the lead chlorid as, and a new 2'. The process of treating substances con- 

